Party like it’s 1994! More than 20 years after All That first premiered on Nickelodeon, the cast of the teen variety show reunited at Stan Lee’s Comikaze Expo in L.A. on Sunday, Nov. 1. And in a moment straight out of your ’90s dreams, they broke into the famous theme song, “All That,” originally performed by TLC.

Two generations of cast members — including Kel Mitchell, Lori Beth Denberg, Alisa Reyes, Mark Saul, and Angelique Bates — sang through the entire opening a cappella, complete with rapping and beatboxing. Mitchell, 37, who recently reunited with his Good Burger costar (and fellow All That alum) Kenan Thompson, even stood up and started dancing.

“Super Awesome Day at #Comikaze15 at the #AllThat Reunion!!” he captioned one of the photos. “It was great meeting all of the Fans!! S/O out to Regina, Stan Lee, and the #comikaze15 staff, you guys are awesome!!”